[clang] [analyzer][NFC] Clean up `MemRegion.cpp` and align with llvm coding style (PR #218860)

[Balázs Benics via cfe-commits]

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@@ -808,13 +808,11 @@ std::string MemRegion::getDescriptiveName(bool UseQuotes,
 
 SourceRange MemRegion::sourceRange() const {
   // Check for more specific regions first.
-  if (auto *FR = dyn_cast<FieldRegion>(this)) {
+  if (auto *FR = dyn_cast<FieldRegion>(this))
     return FR->getDecl()->getSourceRange();
-  }
 
-  if (auto *VR = dyn_cast<VarRegion>(this->getBaseRegion())) {
+  if (auto *VR = dyn_cast<VarRegion>(this->getBaseRegion()))
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steakhal wrote:

These brace changes doesn't really pull their weight.

https://github.com/llvm/llvm-project/pull/218860