https://github.com/llvm/llvm-project/commit/a5e10e248efc72e7909e4067060e89c35a456a18

diff --git a/llvm/lib/TargetParser/Host.cpp b/llvm/lib/TargetParser/Host.cpp
index 81309280a44b..8e9d3e97f5a3 100644
--- a/llvm/lib/TargetParser/Host.cpp
+++ b/llvm/lib/TargetParser/Host.cpp
@@ -1912,6 +1912,9 @@ static Triple withHostArch(Triple T) {
 #elif defined(__x86_64__)
   T.setArch(Triple::x86_64);
   T.setArchName("x86_64");
+#elif defined(__i386__)
+  T.setArch(Triple::x86);
+  T.setArchName("i386");
 #elif defined(__powerpc__)
   T.setArch(Triple::ppc);
   T.setArchName("powerpc");