fix SIMD bool vector initializers

lib/Target/JSBackend/JSBackend.cpp

diff --git a/lib/Target/JSBackend/JSBackend.cpp b/lib/Target/JSBackend/JSBackend.cpp
index 865325c..ff45444 100644
--- a/lib/Target/JSBackend/JSBackend.cpp
+++ b/lib/Target/JSBackend/JSBackend.cpp
@@ -2882,11 +2882,13 @@
           // SIMD.js has only a fixed set of SIMD types, and no arbitrary vector sizes like <float x 3> or <i8 x 7>, so
           // codegen rounds up to the smallest appropriate size where the LLVM vector fits.
           unsigned simdJsNumElements = VT->getNumElements();
-          if (simdJsNumElements < 2 && VT->getElementType()->getPrimitiveSizeInBits() > 32) simdJsNumElements = 2;
-          else if (simdJsNumElements < 4 && VT->getElementType()->getPrimitiveSizeInBits() <= 32) simdJsNumElements = 4;
-          else if (simdJsNumElements < 8 && VT->getElementType()->getPrimitiveSizeInBits() <= 16) simdJsNumElements = 8;
-          else if (simdJsNumElements < 16 && VT->getElementType()->getPrimitiveSizeInBits() <= 8) simdJsNumElements = 16;
-
+          auto sizeInBits = VT->getElementType()->getPrimitiveSizeInBits();
+          if (sizeInBits > 1) {
+            if (simdJsNumElements < 2 && sizeInBits > 32) simdJsNumElements = 2;
+            else if (simdJsNumElements < 4 && sizeInBits <= 32) simdJsNumElements = 4;
+            else if (simdJsNumElements < 8 && sizeInBits <= 16) simdJsNumElements = 8;
+            else if (simdJsNumElements < 16 && sizeInBits <= 8) simdJsNumElements = 16;
+          }
           for (unsigned i = 1; i < simdJsNumElements; ++i) {
             Out << ",0";
           }