[clang] Fix typo "x84_64" (PR #68419)

[Casey Carter via cfe-commits]

CaseyCarter wrote:

The test failure _cannot possibly_ be related to this nearly non-functional change. Shall I merge anyway, or rerun?
```
******************** TEST 'BOLT :: RISCV/reloc-tls.s' FAILED ********************
  | Exit Code: 1
  |  
  | Command Output (stderr):
  | --
  | RUN: at line 1: /var/lib/buildkite-agent/builds/linux-56-7f758798dd-khkmx-1/llvm-project/github-pull-requests/build/bin/llvm-mc -triple riscv64 -filetype obj -o /var/lib/buildkite-agent/builds/linux-56-7f758798dd-khkmx-1/llvm-project/github-pull-requests/build/tools/bolt/test/RISCV/Output/reloc-tls.s.tmp.o /var/lib/buildkite-agent/builds/linux-56-7f758798dd-khkmx-1/llvm-project/github-pull-requests/bolt/test/RISCV/reloc-tls.s
  | + /var/lib/buildkite-agent/builds/linux-56-7f758798dd-khkmx-1/llvm-project/github-pull-requests/build/bin/llvm-mc -triple riscv64 -filetype obj -o /var/lib/buildkite-agent/builds/linux-56-7f758798dd-khkmx-1/llvm-project/github-pull-requests/build/tools/bolt/test/RISCV/Output/reloc-tls.s.tmp.o /var/lib/buildkite-agent/builds/linux-56-7f758798dd-khkmx-1/llvm-project/github-pull-requests/bolt/test/RISCV/reloc-tls.s
  | RUN: at line 2: /var/lib/buildkite-agent/builds/linux-56-7f758798dd-khkmx-1/llvm-project/github-pull-requests/build/bin/ld.lld --emit-relocs -o /var/lib/buildkite-agent/builds/linux-56-7f758798dd-khkmx-1/llvm-project/github-pull-requests/build/tools/bolt/test/RISCV/Output/reloc-tls.s.tmp /var/lib/buildkite-agent/builds/linux-56-7f758798dd-khkmx-1/llvm-project/github-pull-requests/build/tools/bolt/test/RISCV/Output/reloc-tls.s.tmp.o
  | + /var/lib/buildkite-agent/builds/linux-56-7f758798dd-khkmx-1/llvm-project/github-pull-requests/build/bin/ld.lld --emit-relocs -o /var/lib/buildkite-agent/builds/linux-56-7f758798dd-khkmx-1/llvm-project/github-pull-requests/build/tools/bolt/test/RISCV/Output/reloc-tls.s.tmp /var/lib/buildkite-agent/builds/linux-56-7f758798dd-khkmx-1/llvm-project/github-pull-requests/build/tools/bolt/test/RISCV/Output/reloc-tls.s.tmp.o
  | RUN: at line 3: /var/lib/buildkite-agent/builds/linux-56-7f758798dd-khkmx-1/llvm-project/github-pull-requests/build/bin/llvm-bolt --print-cfg --print-only=tls_le,tls_ie -o /dev/null /var/lib/buildkite-agent/builds/linux-56-7f758798dd-khkmx-1/llvm-project/github-pull-requests/build/tools/bolt/test/RISCV/Output/reloc-tls.s.tmp     \| /var/lib/buildkite-agent/builds/linux-56-7f758798dd-khkmx-1/llvm-project/github-pull-requests/build/bin/FileCheck /var/lib/buildkite-agent/builds/linux-56-7f758798dd-khkmx-1/llvm-project/github-pull-requests/bolt/test/RISCV/reloc-tls.s
  | + /var/lib/buildkite-agent/builds/linux-56-7f758798dd-khkmx-1/llvm-project/github-pull-requests/build/bin/FileCheck /var/lib/buildkite-agent/builds/linux-56-7f758798dd-khkmx-1/llvm-project/github-pull-requests/bolt/test/RISCV/reloc-tls.s
  | + /var/lib/buildkite-agent/builds/linux-56-7f758798dd-khkmx-1/llvm-project/github-pull-requests/build/bin/llvm-bolt --print-cfg --print-only=tls_le,tls_ie -o /dev/null /var/lib/buildkite-agent/builds/linux-56-7f758798dd-khkmx-1/llvm-project/github-pull-requests/build/tools/bolt/test/RISCV/Output/reloc-tls.s.tmp
  | /var/lib/buildkite-agent/builds/linux-56-7f758798dd-khkmx-1/llvm-project/github-pull-requests/bolt/test/RISCV/reloc-tls.s:14:11: error: CHECK: expected string not found in input
  | // CHECK: auipc a0, %pcrel_hi(__BOLT_got_zero+{{[0-9]+}})
  | ^
  | <stdin>:63:70: note: scanning from here
  | 00000004: auipc a0, %pcrel_hi(__BOLT_got_zero+74232) # Label: .Ltmp0
  | ^
  | <stdin>:64:9: note: possible intended match here
  | 00000008: ld a0, %pcrel_lo(.Ltmp0)(a0)
  | ^
  |  
  | Input file: <stdin>
  | Check file: /var/lib/buildkite-agent/builds/linux-56-7f758798dd-khkmx-1/llvm-project/github-pull-requests/bolt/test/RISCV/reloc-tls.s
  |  
  | -dump-input=help explains the following input dump.
  |  
  | Input was:
  | <<<<<<
  | .
  | .
  | .
  | 58: }
  | 59: .LBB01 (4 instructions, align : 1)
  | 60:  Entry Point
  | 61:  CFI State : 0
  | 62:  00000000: addi zero, zero, 0 # Size: 4 # NOP: 1
  | 63:  00000004: auipc a0, %pcrel_hi(__BOLT_got_zero+74232) # Label: .Ltmp0
  | check:14'0                                                                          X error: no match found
  | 64:  00000008: ld a0, %pcrel_lo(.Ltmp0)(a0)
  | check:14'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  | check:14'1             ?                                possible intended match
  | 65:  0000000c: jalr zero, 0(ra)
  | check:14'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  | 66:  CFI State: 0
  | check:14'0     ~~~~~~~~~~~~~~
  | 67:
  | check:14'0     ~
  | 68: DWARF CFI Instructions:
  | check:14'0     ~~~~~~~~~~~~~~~~~~~~~~~~
  | 69:  <empty>
  | check:14'0     ~~~~~~~~~
  | .
  | .
  | .
  | >>>>>>
```


https://github.com/llvm/llvm-project/pull/68419