Merge pull request #153 from practicalswift/clean-up-crash-cases

...x64-empty-tombstone-value-shouldnt-be-inserted-into-map.c

...egress/c-crashers/crash-02-hexagon-index-lt-size-failed.c

suite/regress/c-crashers/crash-03-x64-invalid-index.c

.../c-crashers/crash-04-hexagon-readcount-not-equal-to-one.c

...-crashers/crash-05-x64-normal-symbols-cannot-be-unnamed.c

...h-06-systemz-exponent-has-no-digits-in-apfloat-line-126.c

...h-07-systemz-exponent-has-no-digits-in-apfloat-line-131.c

...-systemz-invalid-character-in-exponent-absexponent-case.c

...ash-09-hexagon-invalid-character-in-exponent-value-case.c

...h-10-x64-stringref-cannot-be-built-from-a-null-argument.c

...ystemz-elfobjectwriter-should-not-have-constructed-this.c

suite/regress/c-crashers/crash-14-x64-invalid-accessor.c

...6-arm-expression-value-must-be-representable-in-32-bits.c

...ress/c-crashers/crash-19-arm-unable-to-encode-mcoperand.c

...ystemz-segfault-in-llvm-mcassembler-computefragmentsize.c

...rs/crash-21-x64-llvm-error-expected-absolute-expression.c

...egress/c-crashers/crash-22-x64-this-is-not-an-immediate.c

...hers/crash-23-x64-value-does-not-fit-in-the-fixup-field.c

...8-x64-llvm-error-unable-to-evaluate-offset-for-variable.c