[arm64] Implement Float(32|64)(Min|Max) using fcsel.

src/compiler/instruction-selector-impl.h

Index: src/compiler/instruction-selector-impl.h
diff --git a/src/compiler/instruction-selector-impl.h b/src/compiler/instruction-selector-impl.h
index e22f5458697b852f59300dc5e4011298673da45e..aa2e3546fd0822dd8d60b3f01e6b81d89deb503c 100644
--- a/src/compiler/instruction-selector-impl.h
+++ b/src/compiler/instruction-selector-impl.h
@@ -259,20 +259,22 @@ class FlagsContinuation final {
   }
 
   // Creates a new flags continuation from the given condition and result node.
-  FlagsContinuation(FlagsCondition condition, Node* result)
-      : mode_(kFlags_set), condition_(condition), result_(result) {
+  FlagsContinuation(FlagsCondition condition, Node* result,
+                    FlagsMode mode = kFlags_set)
+      : mode_(mode), condition_(condition), result_(result) {
     DCHECK_NOT_NULL(result);
   }
 
   bool IsNone() const { return mode_ == kFlags_none; }
   bool IsBranch() const { return mode_ == kFlags_branch; }
   bool IsSet() const { return mode_ == kFlags_set; }
+  bool IsSelect() const { return mode_ == kFlags_select; }
   FlagsCondition condition() const {
     DCHECK(!IsNone());
     return condition_;
   }
   Node* result() const {
-    DCHECK(IsSet());
+    DCHECK(IsSet() || IsSelect());
     return result_;
   }
   BasicBlock* true_block() const {
@@ -346,9 +348,9 @@ class FlagsContinuation final {
  private:
   FlagsMode mode_;
   FlagsCondition condition_;
-  Node* result_;             // Only valid if mode_ == kFlags_set.
-  BasicBlock* true_block_;   // Only valid if mode_ == kFlags_branch.
-  BasicBlock* false_block_;  // Only valid if mode_ == kFlags_branch.
+  Node* result_;             // Valid if mode_ == kFlags_set or kFlags_select.
+  BasicBlock* true_block_;   // Valid if mode_ == kFlags_branch.
+  BasicBlock* false_block_;  // Valid if mode_ == kFlags_branch.
 };