[clangd] Run SignatureHelp using an up-to-date preamble, waiting if needed.

Summary:
After code completion inserts a header, running signature help using the old
preamble will usually fail. So we add support for consistent preamble reads.

Reviewers: ilya-biryukov

Subscribers: javed.absar, ioeric, MaskRay, jkorous, arphaman, kadircet, cfe-commits

Differential Revision: https://reviews.llvm.org/D51438

llvm-svn: 341076
4 files changed
tree: 9587402f9f90f9c48c8e9faed3bad2ce35a1fc1e
  1. clang/
  2. clang-tools-extra/
  3. compiler-rt/
  4. debuginfo-tests/
  5. libclc/
  6. libcxx/
  7. libcxxabi/
  8. libunwind/
  9. lld/
  10. lldb/
  11. llgo/
  12. llvm/
  13. openmp/
  14. parallel-libs/
  15. polly/
  16. README.md
README.md

Low Level Virtual Machine (LLVM)

This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments.