Revert "Revert "SkSL function inlining""

This reverts commit 1b63b4ac6933ccddb15bcf650cd5747d5eba44d0.

Change-Id: I8120bb10cecc6889f4f4fd7b4c3a61d250e49219
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/291358
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
diff --git a/src/sksl/SkSLMetalCodeGenerator.cpp b/src/sksl/SkSLMetalCodeGenerator.cpp
index 099ab4c..2b222d8 100644
--- a/src/sksl/SkSLMetalCodeGenerator.cpp
+++ b/src/sksl/SkSLMetalCodeGenerator.cpp
@@ -1164,11 +1164,15 @@
 }
 
 void MetalCodeGenerator::writeBlock(const Block& b) {
-    this->writeLine("{");
-    fIndentation++;
+    if (b.fIsScope) {
+        this->writeLine("{");
+        fIndentation++;
+    }
     this->writeStatements(b.fStatements);
-    fIndentation--;
-    this->write("}");
+    if (b.fIsScope) {
+        fIndentation--;
+        this->write("}");
+    }
 }
 
 void MetalCodeGenerator::writeIfStatement(const IfStatement& stmt) {