[PowerPC] Support PIC Secure PLT for CALL_RM https://reviews.llvm.org/D111433 introduced PPCISD::CALL_RM for -frounding-math. -msecure-plt -frounding-math {-fpic,-fPIC} codegen for PPC32 became incorrect when a function contains function calls but no global variable references (GlobalBaseReg). As reported by @q66 , musl/src/dirent/closedir.c implements such a function, which is miscompiled. PPCISD::CALL has custom logic to set up the base register (https://reviews.llvm.org/D42112). Add an extra case for CALL_RM. While here, improve the test to * actually test `case PPCISD::CALL`: we need a non-leaf function that doesn't access global variables (global variables lead to GlobalBaseReg, which call `getGlobalBaseReg()` as well). * test `ExternalSymbolSDNode` with a memset. Supersedes: #72758 Pull Request: https://github.com/llvm/llvm-project/pull/121281
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