[llvm-bugs] [Bug 43700] New: Label array with unused result results in clang crash

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https://bugs.llvm.org/show_bug.cgi?id=43700

            Bug ID: 43700
           Summary: Label array with unused result results in clang crash
           Product: clang
           Version: 9.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: spiritual.dragon.of.ra at gmail.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org,
                    neeilans at live.com, richard-llvm at metafoo.co.uk

Created attachment 22685
  --> https://bugs.llvm.org/attachment.cgi?id=22685&action=edit
Attached: Backtrace, preprocessed source and associated run script

Overview:
 Declaring a label array with at least 3 labels while not assigning the result
to a variable, causes a segmentation fault to occur.
Attached is the resulting log of the command "clang -v
clang_empty_lbl_array.c".

Steps to reproduce:
 Compile the code shown below (which should result in an empty main()) with the
command "clang clang_empty_lbl_array.c".

int main () {
 (void * []) { &&L3, &&L2, &&L1 };
 L1: ;
 L2: ;
 L3: ;
}

Actual Results:
 clang crashes, resulting in no executable being generated.

Expected Results:
 Generation of executable (with a warning) equivalent to:
int main () {
 L1: ;
 L2: ;
 L3: ;
}

Build Date & Hardware:
 Built 17/Oct/2019 on:
  > clang --version
    clang version 9.0.0 (tags/RELEASE_900/final)
    Target: x86_64-pc-linux-gnu
    Thread model: posix
    InstalledDir: /usr/bin

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