Add crash case crash-31-x64-layout-bookkeeping-error.c

Merge pull request #158 from practicalswift/crash-30-x64-attempt-to-compute-fragment-before-its-predecessor.c

Add crash case crash-30-x64-attempt-to-compute-fragment-before-its-predecessor.c

Add crash case triggering "Invalid scale!" assertion failure.

Clean up crash cases in order to improve readability

Add nine round-trip test cases

Merge pull request #151 from practicalswift/add-crash-28-x64-llvm-error-unable-to-evaluate-offset-for-variable

Add LLVM error crash case.

Minimize crash case.

Add roundtrip failure: vpminuq zmm21 {k2}, zmm15, zmmword ptr [r10 - 0x1300]

Minimize crash case crash-01-x64-empty-tombstone-value-shouldnt-be-inserted-into-map.c

Make c-crashers compile without warnings under gcc too