[sanitizer] Fix vfork interceptor on i386 w/ dynamic runtime. PLT calls on i386 expect GOT base address in %ebx. This call does not need to go through PLT strictly speaking, but I'd rather avoid future surprises and implement the most general case. git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@355125 91177308-0d34-0410-b5e6-96231b3b80d8 
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