Michael Francis 922f42d531 [clang][AIX] Fix mcount name and call arguments ...

Currently, compiling a program with the `-pg` flag will result in an
undefined symbol error for `.mcount`. This revision fixes the call to
use `__mcount`, which requires a pointer argument to a pointer-sized
object (unique per inserted call) on AIX.

This is only a partial fix. This patch should fix the `-pg` flag's
behaviour on AIX to work with code you are compiling, but it will not
link against standard libraries with `mcount` instrumentation calls. The
next step is to add profiled libraries to the linker search paths in the
Clang driver for the AIX toolchain when linking with `-pg`.

Differential Review: https://reviews.llvm.org/D135384

2022-10-20 16:20:00 -04:00

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