[clang] Make "__GCC_HAVE_DWARF2_CFI_ASM" a proper predefined macro (#… #11748
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…165731)
Use a flag to determine whether this macro should be set when intializing the preprocessor.
This macro was added to the driver in
9d117e7 because it can be conditionally disabled, but before that, the flag to gate behavior was removed under the assumption it wasn't conditional in
b5b622a. This patch is to connect the macro with the preexisting flag
(cherry picked from commit d65e712)