[ELF] - Linker script: add tests for checking malformed numbers parsing.

Previoulsy we had no test that covered malfolmed numbers
with 'H', 'K' and 'M' suffixes, so the following lines
were uncovered:

https://github.com/llvm-mirror/lld/blob/master/ELF/ScriptParser.cpp#L996
https://github.com/llvm-mirror/lld/blob/master/ELF/ScriptParser.cpp#L1003
https://github.com/llvm-mirror/lld/blob/master/ELF/ScriptParser.cpp#L1008

Patch fixes that.

llvm-svn: 335979