[compiler-rt] Fix incorrect handling of indirect load.

Summary:
Indirect load are relative offset from RIP.

The current trampoline implementation is incorrectly
copying these instructions which make some unittests
crashing.

This patch is not fixing the unittests but it's fixing
the crashes. The functions are no longer hooked.

Patches will come soon to fix these unittests.

Reviewers: rnk

Subscribers: llvm-commits, wang0109, chrisha

Differential Revision: https://reviews.llvm.org/D22410

llvm-svn: 275892