Nullability in DITemplateType and DITemplateValue

[langston-barrett]

Output from clang++ and llvm-dis 6:

!385 = !DITemplateTypeParameter(name: "_Up", type: !124)
!386 = !DITemplateTypeParameter(name: "_Ep", type: !168)
!387 = !DITemplateTypeParameter(type: null)

LLVM source:

• https://github.com/llvm-mirror/llvm/blob/release_60/lib/Bitcode/Reader/MetadataLoader.cpp#L1516
• https://github.com/llvm-mirror/llvm/blob/release_60/lib/Bitcode/Reader/MetadataLoader.cpp#L1529

[langston-barrett]

Here's some output from llvm-bcanalyzer on that same file (note the zeroes):

    <TEMPLATE_TYPE op0=0 op1=0 op2=3988/>

and later:

    <TEMPLATE_VALUE op0=0 op1=48 op2=707 op3=3931 op4=3660/>

[langston-barrett]

Closing to minimize the Fryingpan build matrix.