https://bugs.llvm.org/show_bug.cgi?id=34170

            Bug ID: 34170
           Summary: clang 5.0 segfaults compiling firefox
                    mozilla::dom::CanvasRenderingContext2D::GetImageData(J
                    SContext*, double, double, double, double,
                    mozilla::ErrorResult&)
           Product: clang
           Version: 5.0
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangb...@nondot.org
          Reporter: raj.k...@gmail.com
                CC: dgre...@apple.com, llvm-bugs@lists.llvm.org

testcase and script to execute is is here 

https://uclibc.org/~kraj/test.tar.bz2

Results in

fatal error: error in backend: Cannot select: 0x15cd6dc048: i32 = truncate
0x15ccede710
  0x15ccede710: f64,ch = CopyFromReg 0x15c5d6d6a8, Register:f64 %vreg13
    0x15ccede1c8: f64 = Register %vreg13
In function:
_ZN7mozilla3dom24CanvasRenderingContext2D12GetImageDataEP9JSContextddddRNS_11ErrorResultE

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