[clang] [llvm] Enable fexec-charset option (PR #138895)

[Abhina Sree via cfe-commits]

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+// RUN: %clang_cc1 %s -emit-llvm -triple s390x-none-zos -fexec-charset IBM-1047 -o - | FileCheck %s
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abhina-sree wrote:

I've added these tests in a followup PR https://github.com/llvm/llvm-project/pull/169803

https://github.com/llvm/llvm-project/pull/138895