Fix AsmPrinter crashes with assertion. Bug 15318 in Bugzilla

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177472 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/APFloat.cpp b/lib/Support/APFloat.cpp
index 5b68fbb..6182e34 100644
--- a/lib/Support/APFloat.cpp
+++ b/lib/Support/APFloat.cpp
@@ -3311,10 +3311,8 @@
 
     significand = significand.udiv(divisor);
 
-    // Truncate the significand down to its active bit count, but
-    // don't try to drop below 32.
-    unsigned newPrecision = std::max(32U, significand.getActiveBits());
-    significand = significand.trunc(newPrecision);
+    // Truncate the significand down to its active bit count.
+    significand = significand.trunc(significand.getActiveBits());
   }