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[sanitizer] Handle null in internal_sigaction_syscall

Authored by bruening on Jul 6 2016, 1:13 PM.

Description

[sanitizer] Handle null in internal_sigaction_syscall

Summary:
Adds support for nullptr as the action parameter to
internal_sigaction_syscall().

Reviewers: aizatsky

Subscribers: kubabrecka, vitalybuka, zhaoqin, kcc, eugenis, llvm-commits

Differential Revision: http://reviews.llvm.org/D22061

llvm-svn: 274665

Details