[NFCI][asm][i386/x86-64] Enable AT&T syntax explicitly (#164453)

Implementation files using the Intel syntax explicitly specify it.
Do the same for the few files using AT&T syntax.

This also enables building LLVM with `-mllvm -x86-asm-syntax=intel` in one's Clang config files
(i.e. a global preference for Intel syntax).

No functional change intended.

GitOrigin-RevId: c208a23643231d0b19c6f795895a16dfe6797340
2 files changed
tree: 7afa973419a1477a44df688df0d4092d7a0adfc0
  1. cmake/
  2. docs/
  3. include/
  4. src/
  5. test/
  6. .clang-format
  7. CMakeLists.txt
  8. LICENSE.TXT