llvm dev - Feb 2020 - LLVM90 build failures on Android build environment

In file included from external/llvm/lib/Support/Signals.cpp:220:
external/llvm/lib/Support/Unix/Signals.inc:388:23: error: no matching
constructor for initialization of 'SaveAndRestore<int>'
  SaveAndRestore<int> SaveErrnoDuringASignalHandler(errno);
                      ^ ~~~~~
external/llvm/lib/Support/../../include/llvm/Support/SaveAndRestore.h:21:30:
note: candidate constructor (the implicit copy constructor) not viable: no
known conversion from 'volatile int' to 'const
llvm::SaveAndRestore<int>'
for 1st argument
template <typename T> struct SaveAndRestore {
                             ^
external/llvm/lib/Support/../../include/llvm/Support/SaveAndRestore.h:22:3:
note: candidate constructor not viable: 1st argument ('volatile int')
would
lose volatile qualifier
  SaveAndRestore(T &X) : X(X), OldValue(X) {}
  ^
external/llvm/lib/Support/../../include/llvm/Support/SaveAndRestore.h:23:3:
note: candidate constructor not viable: requires 2 arguments, but 1 was
provided
  SaveAndRestore(T &X, const T &NewValue) : X(X), OldValue(X) {
  ^
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