[turbofan] ARM: Reduce out-of-line NaN code size

src/compiler/arm/code-generator-arm.cc

Index: src/compiler/arm/code-generator-arm.cc
diff --git a/src/compiler/arm/code-generator-arm.cc b/src/compiler/arm/code-generator-arm.cc
index 5c94ccf7c3b2d07bb6ce1b379cf99d14135080db..ddba29d2d68dc3edf3a317600d92ff5fe607ea82 100644
--- a/src/compiler/arm/code-generator-arm.cc
+++ b/src/compiler/arm/code-generator-arm.cc
@@ -165,7 +165,9 @@ class OutOfLineLoadFloat32 final : public OutOfLineCode {
       : OutOfLineCode(gen), result_(result) {}
 
   void Generate() final {
-    __ vmov(result_, std::numeric_limits<float>::quiet_NaN());
+    // Compute sqrtf(-1.0f), which results in a quiet single-precision NaN.
+    __ vmov(result_, -1.0f);
+    __ vsqrt(result_, result_);
   }
 
  private:
@@ -179,7 +181,9 @@ class OutOfLineLoadFloat64 final : public OutOfLineCode {
       : OutOfLineCode(gen), result_(result) {}
 
   void Generate() final {
-    __ vmov(result_, std::numeric_limits<double>::quiet_NaN(), kScratchReg);
+    // Compute sqrt(-1.0), which results in a quiet double-precision NaN.
+    __ vmov(result_, -1.0);
+    __ vsqrt(result_, result_);
   }
 
  private: