[ELF] make default for get{ARM,AArch64}UndefinedRelativeWeakVA unreachable      The get{ARM,AArch64}UndefinedRelativeWeakVA() functions should only be called for PC-relative relocations. Complete the supported pc-relative relocations in the switch statement and make the default case unreachable.
[ELF] make default for get{ARM,AArch64}UndefinedRelativeWeakVA unreachable
    
The get{ARM,AArch64}UndefinedRelativeWeakVA() functions should only be
called for PC-relative relocations. Complete the supported pc-relative
relocations in the switch statement and make the default case unreachable.

The R_ARM_TARGET relocation can be evaluated as R_ARM_REL32 but it is only
used in the context of exception tables, and is never output with respect
to a weak reference so it does not appear in the switch statement.
    
Differential Revision: https://reviews.llvm.org/D34138



git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@305673 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld