[SandboxIR][NFC] Move Region from SandboxVectorizer to SandboxIR. (#110173)

I'm planning to add RegionPass and RegionPassManager next to the
equivalent FunctionPass and FunctionPassManager in SandboxIR, which
means that SandboxIR has to know about Regions.

There's nothing vectorizer-specific about the Region class, and the only
thing using Regions at this moment is the unit test, so this is a
straightforward file move.

Author: slackito

llvm/include/llvm/Transforms/Vectorize/SandboxVectorizer/Region.h renamed to llvm/include/llvm/SandboxIR/Region.h

@@ -3,6 +3,7 @@ add_llvm_component_library(LLVMSandboxIR
   Module.cpp
   Pass.cpp
   PassManager.cpp
+  Region.cpp
   SandboxIR.cpp
   Tracker.cpp
   Type.cpp

llvm/lib/SandboxIR/CMakeLists.txt

@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "llvm/Transforms/Vectorize/SandboxVectorizer/Region.h"
+#include "llvm/SandboxIR/Region.h"
 
 namespace llvm::sandboxir {
 

llvm/lib/Transforms/Vectorize/SandboxVectorizer/Region.cpp renamed to llvm/lib/SandboxIR/Region.cpp

@@ -5,7 +5,6 @@ add_llvm_component_library(LLVMVectorize
   LoopVectorize.cpp
   SandboxVectorizer/DependencyGraph.cpp
   SandboxVectorizer/Passes/BottomUpVec.cpp
-  SandboxVectorizer/Region.cpp
   SandboxVectorizer/SandboxVectorizer.cpp
   SLPVectorizer.cpp
   Vectorize.cpp

llvm/lib/Transforms/Vectorize/CMakeLists.txt

@@ -7,6 +7,7 @@ set(LLVM_LINK_COMPONENTS
 
 add_llvm_unittest(SandboxIRTests
   PassTest.cpp
+  RegionTest.cpp
   SandboxIRTest.cpp
   TrackerTest.cpp
   TypesTest.cpp

llvm/unittests/SandboxIR/CMakeLists.txt

@@ -11,5 +11,4 @@ add_llvm_unittest(SandboxVectorizerTests
   DependencyGraphTest.cpp
   InstrIntervalTest.cpp
   LegalityTest.cpp
-  RegionTest.cpp
   )