Reland r330223, "COFF: Merge .idata, .didat and .edata into .rdata by default.", which was reverted in r330228.
In this reland I removed an unnecessary use of /debug in the test
delayimports32.test and used the /pdbaltpath flag in the test
pdb-publics-import.test, both of which avoid embedding absolute PDB
paths in executables which could affect later RVAs.
Original commit message:
COFF: Merge .idata, .didat and .edata into .rdata by default.
This saves a little space and matches what link.exe does.
Tested using the chromium Windows trybots:
Differential Revision: https://reviews.llvm.org/D45737