[OMPT] Use alloca() to force availability of frame pointer
[OMPT] Use alloca() to force availability of frame pointer

When compiling with icc, there is a problem with reenter frame addresses in
parallel_begin callbacks in the interoperability.c testcase. (The address is
not available. thus NULL)
Using alloca() forces availability of the frame pointer.

Patch provided by Simon Convent

Differential Revision: https://reviews.llvm.org/D48282

git-svn-id: f99161ee8ccfe2101cbe1bdda2220bce2ed25485@336088 91177308-0d34-0410-b5e6-96231b3b80d8

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