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# d48ef7ca 15-May-2020 Raphael Isemann <teemperor@gmail.com>

[lldb] Print full Clang diagnostics when the ClangModulesDeclVendor fails to compile a module

Summary:
When the ClangModulesDeclVendor currently fails it just prints very basic and often incomplete

[lldb] Print full Clang diagnostics when the ClangModulesDeclVendor fails to compile a module

Summary:
When the ClangModulesDeclVendor currently fails it just prints very basic and often incomplete diagnostics without any source locations:
```
(lldb) p @import Foundation
error: while importing modules:
'foo/bar.h' file not found
could not build module 'Darwin'
[...]
```
or even just
```
(lldb) p @import Foundation
error: while importing modules:
could not build module 'Darwin'
[...]
```

These diagnostics help neither the user nor us with figuring out what is the reason for the failure.

This patch wires up a full TextDiagnosticPrinter in the ClangModulesDeclVendor and makes
sure we always return the error stream to the user when we fail to compile our modules.

Fixes rdar://63216849

Reviewers: aprantl, jdoerfert

Reviewed By: aprantl

Subscribers: JDevlieghere

Differential Revision: https://reviews.llvm.org/D79947

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