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[clang][NewPM] Fix broken -O0 test from the AlwaysInliner

Description

[clang][NewPM] Fix broken -O0 test from the AlwaysInliner

This contains the part of D62225 which prevents insertion of lifetime
intrinsics when creating the AlwaysInliner. This fixes the following tests
when the new PM is enabled by default:

Clang :: CodeGen/aarch64-neon-across.c
Clang :: CodeGen/aarch64-neon-fcvt-intrinsics.c
Clang :: CodeGen/aarch64-neon-fma.c
Clang :: CodeGen/aarch64-neon-perm.c
Clang :: CodeGen/aarch64-neon-tbl.c
Clang :: CodeGen/aarch64-poly128.c
Clang :: CodeGen/aarch64-v8.2a-neon-intrinsics.c
Clang :: CodeGen/arm-neon-fma.c
Clang :: CodeGen/arm-neon-numeric-maxmin.c
Clang :: CodeGen/arm-neon-vcvtX.c
Clang :: CodeGen/avx-builtins.c
Clang :: CodeGen/builtins-ppc-p9vector.c
Clang :: CodeGen/builtins-ppc-vsx.c
Clang :: CodeGen/lifetime.c
Clang :: CodeGen/sse-builtins.c
Clang :: CodeGen/sse2-builtins.c

Differential Revision: https://reviews.llvm.org/D63153

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