The version of `rustc` we build had some `compiler-builtins` updates that broke stuff. Later version
of rustc in the 1.82 train landed more `compiler-builtins` updates that unbroke the stuff. We need at
least some of that to make the version of rustc we landed on work.

See also: <https://github.com/rust-lang/rust/pull/128691>

diff --git a/Cargo.lock b/Cargo.lock
index 13b8eaea068..c2b8483b5b2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -739,9 +739,9 @@ checksum = "55b672471b4e9f9e95499ea597ff64941a309b2cdbffcc46f2cc5e2d971fd335"
 
 [[package]]
 name = "compiler_builtins"
-version = "0.1.114"
+version = "0.1.123"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "eb58b199190fcfe0846f55a3b545cd6b07a34bdd5930a476ff856f3ebcc5558a"
+checksum = "b47fcbecb558bdad78c7d3a998523c60a50dd6cd046d5fe74163e309e878fff7"
 dependencies = [
  "cc",
  "rustc-std-workspace-core",
diff --git a/compiler/rustc_codegen_cranelift/patches/stdlib-lock.toml b/compiler/rustc_codegen_cranelift/patches/stdlib-lock.toml
index 9ea53e8f848..8d577c836d6 100644
--- a/compiler/rustc_codegen_cranelift/patches/stdlib-lock.toml
+++ b/compiler/rustc_codegen_cranelift/patches/stdlib-lock.toml
@@ -58,9 +58,9 @@ dependencies = [
 
 [[package]]
 name = "compiler_builtins"
-version = "0.1.106"
+version = "0.1.123"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f4ab134a739bafec76aa91ccb15d519a54e569350644a1fea6528d5a0d407e22"
+checksum = "b47fcbecb558bdad78c7d3a998523c60a50dd6cd046d5fe74163e309e878fff7"
 dependencies = [
  "cc",
  "rustc-std-workspace-core",
diff --git a/compiler/rustc_codegen_gcc/build_system/build_sysroot/Cargo.lock b/compiler/rustc_codegen_gcc/build_system/build_sysroot/Cargo.lock
index d6ec1f87d01..771f2f18dce 100644
--- a/compiler/rustc_codegen_gcc/build_system/build_sysroot/Cargo.lock
+++ b/compiler/rustc_codegen_gcc/build_system/build_sysroot/Cargo.lock
@@ -50,7 +50,7 @@ dependencies = [
 
 [[package]]
 name = "compiler_builtins"
-version = "0.1.109"
+version = "0.1.118"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f11973008a8cf741fe6d22f339eba21fd0ca81e2760a769ba8243ed6c21edd7e"
 dependencies = [
diff --git a/compiler/rustc_codegen_gcc/build_system/build_sysroot/Cargo.toml b/compiler/rustc_codegen_gcc/build_system/build_sysroot/Cargo.toml
index e4669923623..05503128f2a 100644
--- a/compiler/rustc_codegen_gcc/build_system/build_sysroot/Cargo.toml
+++ b/compiler/rustc_codegen_gcc/build_system/build_sysroot/Cargo.toml
@@ -6,9 +6,7 @@ resolver = "2"
 
 [dependencies]
 core = { path = "./sysroot_src/library/core" }
-# TODO: after the sync, revert to using version 0.1.
-# compiler_builtins = "0.1"
-compiler_builtins = "=0.1.109"
+compiler_builtins = "0.1"
 alloc = { path = "./sysroot_src/library/alloc" }
 std = { path = "./sysroot_src/library/std", features = ["panic_unwind", "backtrace"] }
 test = { path = "./sysroot_src/library/test" }
diff --git a/library/alloc/Cargo.toml b/library/alloc/Cargo.toml
index 479eb0a2ba7..4365bcc4ad0 100644
--- a/library/alloc/Cargo.toml
+++ b/library/alloc/Cargo.toml
@@ -10,10 +10,7 @@ edition = "2021"
 
 [dependencies]
 core = { path = "../core" }
-compiler_builtins = { version = "0.1.114", features = ['rustc-dep-of-std'] }
-
-[target.'cfg(not(any(target_arch = "aarch64", target_arch = "x86", target_arch = "x86_64")))'.dependencies]
-compiler_builtins = { version = "0.1.114", features = ["no-f16-f128"] }
+compiler_builtins = { version = "0.1.123", features = ['rustc-dep-of-std'] }
 
 [dev-dependencies]
 rand = { version = "0.8.5", default-features = false, features = ["alloc"] }
diff --git a/library/std/Cargo.toml b/library/std/Cargo.toml
index fe601855cc1..b0462d28237 100644
--- a/library/std/Cargo.toml
+++ b/library/std/Cargo.toml
@@ -17,7 +17,7 @@ cfg-if = { version = "1.0", features = ['rustc-dep-of-std'] }
 panic_unwind = { path = "../panic_unwind", optional = true }
 panic_abort = { path = "../panic_abort" }
 core = { path = "../core", public = true }
-compiler_builtins = { version = "0.1.114" }
+compiler_builtins = { version = "0.1.123" }
 profiler_builtins = { path = "../profiler_builtins", optional = true }
 unwind = { path = "../unwind" }
 hashbrown = { version = "0.14", default-features = false, features = [