[clang] [RISCV] Support predefined marcro __riscv_misaligned_{fast,avoid}. (PR #65756)

[Yeting Kuo via cfe-commits]

================
@@ -1220,3 +1220,15 @@
 // RUN: -march=rv64i_zve32x_zvkt1p0 -x c -E -dM %s \
 // RUN: -o - | FileCheck --check-prefix=CHECK-ZVKT-EXT %s
 // CHECK-ZVKT-EXT: __riscv_zvkt 1000000{{$}}
+
+// RUN: %clang -target riscv32-unknown-linux-gnu -march=rv32i -x c -E -dM %s \
----------------
yetingk wrote:

After https://github.com/llvm/llvm-project/pull/66572 merged, I have rebased the patch on this.

https://github.com/llvm/llvm-project/pull/65756