commit 65b01bb302ba1eb7b0240753c22dce39c5ed836b
Author: Nathan Froyd <froydnj@mozilla.com>
Date:   Tue Jul 14 16:50:20 2020 -0400

    mask off cpusubtype bits before determining Mach-O identifiers; r=gsvelto
    
    If we don't do this, we run into problems when walking over the Mach-O load
    commands, where we *do* mask off cpusubtype bits.

diff --git a/src/common/mac/dump_syms.cc b/src/common/mac/dump_syms.cc
index 4ad0e2b..1c9a067 100644
--- a/src/common/mac/dump_syms.cc
+++ b/src/common/mac/dump_syms.cc
@@ -286,7 +286,7 @@ string DumpSymbols::Identifier() {
   FileID file_id(object_filename_.c_str());
   unsigned char identifier_bytes[16];
   cpu_type_t cpu_type = selected_object_file_->cputype;
-  cpu_subtype_t cpu_subtype = selected_object_file_->cpusubtype;
+  cpu_subtype_t cpu_subtype = selected_object_file_->cpusubtype & ~CPU_SUBTYPE_MASK;
   if (!file_id.MachoIdentifier(cpu_type, cpu_subtype, identifier_bytes)) {
     fprintf(stderr, "Unable to calculate UUID of mach-o binary %s!\n",
             object_filename_.c_str());