[clang] [flang] Enable `-m32`, `-maix32` and `-maix64` for Flang on AIX. (PR #136202)

[Daniel Chen via cfe-commits]

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@@ -733,11 +733,16 @@ static llvm::Triple computeTargetTriple(const Driver &D,
         Target.setEnvironment(llvm::Triple::GNUX32);
     } else if (A->getOption().matches(options::OPT_m32) ||
                A->getOption().matches(options::OPT_maix32)) {
-      AT = Target.get32BitArchVariant().getArch();
-      if (Target.getEnvironment() == llvm::Triple::GNUX32)
-        Target.setEnvironment(llvm::Triple::GNU);
-      else if (Target.getEnvironment() == llvm::Triple::MuslX32)
-        Target.setEnvironment(llvm::Triple::Musl);
+      if (D.IsFlangMode() && !Target.isOSAIX())
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DanielCChen wrote:

Good catch! I will fix it.

https://github.com/llvm/llvm-project/pull/136202