[AST] Really allocate a SmallVector to the right size.
set_size only resets the end pointer and asserts if it is used to grow
the buffer. This would crash when mangling a float with more than 80 bits,
add a test with a ppc double double (128 bits).
Found by inspection.
llvm-svn: 243979
diff --git a/clang/lib/AST/ItaniumMangle.cpp b/clang/lib/AST/ItaniumMangle.cpp
index dac803e..e51aad9 100644
--- a/clang/lib/AST/ItaniumMangle.cpp
+++ b/clang/lib/AST/ItaniumMangle.cpp
@@ -700,8 +700,7 @@
assert(numCharacters != 0);
// Allocate a buffer of the right number of characters.
- SmallVector<char, 20> buffer;
- buffer.set_size(numCharacters);
+ SmallVector<char, 20> buffer(numCharacters);
// Fill the buffer left-to-right.
for (unsigned stringIndex = 0; stringIndex != numCharacters; ++stringIndex) {