X86: Fix alias info in GenInlinedIndexOf().

For 32-bit X86, GenInlinedIndexOf() pushes and pops EDI. In
one branch it then calls Load32Disp() with adjusted stack
offset. That calculates wrong alias_info for the generated
insn. If left unfixed, this could confuse load hoisting.

Bug: 17128502

(cherry picked from commit 74de63bb)

Change-Id: I5dc82b7aae9e9655e75843a952b8ebb04269f46b