[lldb] Upgrade CompilerType::GetBitSize to return llvm::Expected #10243
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[lldb] Upgrade CompilerType::GetBitSize to return llvm::Expected (llvm#129601
llvm#129601)
This patch pushes the error handling boundary for the GetBitSize()
methods from Runtime into the Type and CompilerType APIs. This makes
it easier to diagnose problems thanks to more meaningful error
messages being available. GetBitSize() is often the first thing LLDB
asks about a type, so this method is particularly important for a
better user experience.
rdar://145667239
(cherry picked from commit 878a64f)