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from 964fd402c9b d: Merge upstream dmd, druntime 4c18eed967, phobos d945686a4. new 04c9cf5c786 Implement new RTL optimizations pass: fold-mem-offsets

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Summary of changes: gcc/Makefile.in | 1 + gcc/common.opt | 4 + gcc/doc/invoke.texi | 8 + gcc/fold-mem-offsets.cc | 901 +++++++++++++++++++++ gcc/passes.def | 1 + gcc/testsuite/gcc.target/i386/pr52146.c | 2 +- .../gcc.target/riscv/fold-mem-offsets-1.c | 16 + .../gcc.target/riscv/fold-mem-offsets-2.c | 24 + .../gcc.target/riscv/fold-mem-offsets-3.c | 17 + gcc/tree-pass.h | 1 + 10 files changed, 974 insertions(+), 1 deletion(-) create mode 100644 gcc/fold-mem-offsets.cc create mode 100644 gcc/testsuite/gcc.target/riscv/fold-mem-offsets-1.c create mode 100644 gcc/testsuite/gcc.target/riscv/fold-mem-offsets-2.c create mode 100644 gcc/testsuite/gcc.target/riscv/fold-mem-offsets-3.c