[lldb][TypeSystemClang][NFC] Log failure to InitBuiltinTypes

If we fail to initialize the ASTContext builtins, LLDB
may crash in non-obvious ways down-the-line, e.g., when
it tries to call `ASTContext::getTypeSize` on a builtin like
`ast.UnsignedCharTy`, which would derefernce a `null` `QualType`.

The initialization can fail if we either didn't set the
`TypeSystemClang` target triple, or if the embedded clang isn't
enabled for a certain target.

This patch attempts to help pin-point the failure case post-mortem
by adding a log message here that prints the triple.

rdar://134260837

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