Add an AArch64 DAG combine to eliminate redundant truncates feeding into DUPLANE32 operations.
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Authored by resistor on Jan 7 2023, 8:29 PM.

Details

	Time	Test
	60,820 ms	x64 debian > Clang.OpenMP::target_defaultmap_codegen_01.cpp Script: -- : 'RUN: at line 8'; /var/lib/buildkite-agent/builds/llvm-project/build/bin/clang -cc1 -internal-isystem /var/lib/buildkite-agent/builds/llvm-project/build/lib/clang/16/include -nostdsysteminc -no-opaque-pointers -no-enable-noundef-analysis -DCK1 -verify -fopenmp -fopenmp-version=50 -fopenmp-targets=powerpc64le-ibm-linux-gnu -x c++ -triple powerpc64le-unknown-unknown -emit-llvm /var/lib/buildkite-agent/builds/llvm-project/clang/test/OpenMP/target_defaultmap_codegen_01.cpp -o - \| /var/lib/buildkite-agent/builds/llvm-project/build/bin/FileCheck --allow-unused-prefixes -allow-deprecated-dag-overlap /var/lib/buildkite-agent/builds/llvm-project/clang/test/OpenMP/target_defaultmap_codegen_01.cpp --check-prefix CK1