[LLVMdev] PATCH: -dry-run option for llvmc2

[Holger Schurig]

This implements -dry-run for llvmc2:

$ llvmc2 -dry-run main.c
llvm-g++ -c -x c main.c -o /tmp/llvm_bGw2gN/main.bc -emit-llvm
llc -f /tmp/llvm_bGw2gN/main.bc -o /tmp/llvm_bGw2gN/main.s
llvm-gcc -c -x assembler /tmp/llvm_bGw2gN/main.s -o /tmp/llvm_bGw2gN/main.o
llvm-gcc /tmp/llvm_bGw2gN/main.o -o a.out

$ llvmc2 -dry-run -opt main.c
llvm-g++ -c -x c main.c -o /tmp/llvm_UGZtwL/main.bc -emit-llvm
opt /tmp/llvm_UGZtwL/main.bc -o /tmp/llvm_UGZtwL/main.bc
llc -f /tmp/llvm_UGZtwL/main.bc -o /tmp/llvm_UGZtwL/main.s
llvm-gcc -c -x assembler /tmp/llvm_UGZtwL/main.s -o /tmp/llvm_UGZtwL/main.o
llvm-gcc /tmp/llvm_UGZtwL/main.o -o a.out
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