Add support for riscv64

Disable tests for riscv64 (there might be failure, to be tested).
Lower debuginfo verbosify for riscv64.
Incl. a number of upstream changes for detecting riscv64 and detecting
atomic support on riscv64.

Signed-off-by: David Abdurachmanov <david.abdurachmanov@sifive.com>

llvm.spec

@@ -40,7 +40,7 @@
 
 Name:		%{pkg_name}
 Version:	%{maj_ver}.%{min_ver}.%{patch_ver}
-Release:	%{baserelease}%{?rc_ver:.rc%{rc_ver}}%{?dist}
+Release:	%{baserelease}%{?rc_ver:.rc%{rc_ver}}.0.riscv64%{?dist}
 Summary:	The Low Level Virtual Machine
 
 License:	NCSA
@@ -61,6 +61,12 @@ Source4:	https://prereleases.llvm.org/%{version}/hans-gpg-key.asc
 Patch0:		0001-CMake-Split-static-library-exports-into-their-own-ex.patch
 Patch1:		0001-CMake-Split-test-binary-exports-into-their-own-expor.patch
 
+Patch20:	D68899-de1c2877a9ff12899ef50e179ade748fba8ab0c0.patch
+Patch21:	D69003-09856feb3cc141f4f9c8b9edec28602ac4f21575.patch
+Patch22:	D69444-d4a4a32cd94eccbaaa4608b0daac8b820e041214.patch
+Patch23:	f128f442a3d23674bee19ae18e29f92c9dfe40cd.patch
+Patch24:	D68964-cef85193b2cc1817ca43199a0ae9c6f25723997d.patch
+
 BuildRequires:	gcc
 BuildRequires:	gcc-c++
 BuildRequires:	cmake
@@ -170,7 +176,7 @@ pathfix.py -i %{__python3} -pn \
 mkdir -p _build
 cd _build
 
-%ifarch s390 %{arm} %ix86
+%ifarch s390 %{arm} %ix86 riscv64
 # Decrease debuginfo verbosity to reduce memory consumption during final library linking
 %global optflags %(echo %{optflags} | sed 's/-g /-g1 /')
 %endif
@@ -186,7 +192,7 @@ cd _build
 	-DLLVM_PARALLEL_LINK_JOBS=1 \
 	-DCMAKE_BUILD_TYPE=RelWithDebInfo \
 	-DCMAKE_INSTALL_RPATH=";" \
-%ifarch s390 %{arm} %ix86
+%ifarch s390 %{arm} %ix86 riscv64
 	-DCMAKE_C_FLAGS_RELWITHDEBINFO="%{optflags} -DNDEBUG" \
 	-DCMAKE_CXX_FLAGS_RELWITHDEBINFO="%{optflags} -DNDEBUG" \
 %endif
@@ -367,7 +373,7 @@ rm -Rf %{build_install_prefix}/share/opt-viewer
 %check
 # TODO: Fix test failures on arm
 ninja check-all -C _build || \
-%ifarch %{arm}
+%ifarch %{arm} riscv64
   :
 %else
   false
@@ -485,6 +491,9 @@ fi
 %endif
 
 %changelog
+* Mon Mar 30 2020 David Abdurachmanov <david.abdurachmanov@sifive.com> - 10.0.0-1.0.riscv64
+- Add support for riscv64
+
 * Wed Mar 25 2020 sguelton@redhat.com - 10.0.0-1
 - 10.0.0 final