[WebAssembly] Remove unused known_gcc_test_failures.txt. NFC

llvm/lib/Target/WebAssembly/known_gcc_test_failures.txt

-# Tests which are known to fail from the GCC torture test suite.
-
-# Syntax: Each line has a single test to be marked as a 'known failure' (or
-# 'exclusion'. Known failures are expected to fail, and will cause an error if
-# they pass. (Known failures that do not run at all will not cause an
-# error). The format is
-# <name> <attributes> # comment
-
-# blockaddress without an indirectbr still can't be supported
-20071220-1.c O2 # Relocation against a BB address
-20071220-2.c
-990208-1.c
-label13.C O0
-label13a.C O0
-label3.C
-
-# WebAssembly hasn't implemented (will never?) __builtin_return_address
-20010122-1.c
-20030323-1.c
-20030811-1.c
-pr17377.c
-
-# Error: invalid output constraint '=t' in asm.
-990413-2.c
-
-# Error: __builtin_setjmp / __builtin_longjmp is not supported for the current target.
-built-in-setjmp.c
-pr60003.c
-
-# Error in the program / unsupported by Clang.
-20000822-1.c
-20010209-1.c
-20010605-1.c
-20030501-1.c
-20040520-1.c
-20061220-1.c
-20090219-1.c
-920415-1.c
-920428-2.c
-920501-7.c
-920612-2.c
-920721-4.c
-921017-1.c
-921215-1.c
-931002-1.c
-comp-goto-2.c
-nest-align-1.c
-nest-stdar-1.c
-nestfunc-1.c
-nestfunc-2.c
-nestfunc-3.c
-nestfunc-5.c
-nestfunc-6.c
-nestfunc-7.c
-pr22061-3.c
-pr22061-4.c
-pr24135.c
-pr51447.c
-20020412-1.c
-20040308-1.c
-20040423-1.c
-20041218-2.c
-20070919-1.c
-align-nest.c
-pr41935.c
-920302-1.c
-920501-3.c
-920728-1.c
-pr28865.c
-attr-alias-1.C
-attr-alias-2.C
-attr-ifunc-1.C
-attr-ifunc-2.C
-attr-ifunc-3.C
-attr-ifunc-4.C
-complit12.C
-va-arg-pack-1.C
-va-arg-pack-len-1.C
-builtin-line1.C
-devirt-6.C  # bad main signature
-devirt-13.C  # bad main signature
-devirt-14.C  # bad main signature
-devirt-21.C  # bad main signature
-devirt-23.C  # bad main signature
-lifetime2.C  # violates C++ DR1696
-
-# WASI doesn't have stdjmp.h yet
-pr56982.c
-
-# WASI doesn't have pthread.h yet
-thread_local3.C
-thread_local3g.C
-thread_local4.C
-thread_local4g.C
-thread_local5.C
-thread_local5g.C
-
-# Untriaged C++ failures
-spec5.C
-addr1.C
-ef_test.C
-member2.C
-new39.C
-new40.C
-nrv8.C
-offsetof9.C
-opaque-1.C
-pr19650.C
-pr37146-1.C
-pr46149.C
-pr59470.C
-rtti2.C
-self1.C
-type-generic-1.C
-vbase8-10.C
-vbase8-21.C
-vbase8-22.C
-vbase8-4.C
-vector1.C