Import ACPICA 20200717.vendor/acpica/20200717

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+17 July 2020. Summary of changes for version 20200717:
+
+This release is available at https://acpica.org/downloads
+
+
+1) ACPICA kernel-resident subsystem:
+
+Do not increment OperationRegion reference counts for field units. Recent 
+server firmware has revealed that this reference count can overflow on 
+large servers that declare many field units (thousands) under the same 
+OperationRegion. This occurs because each field unit declaration will add 
+a reference count to the source OperationRegion. This release solves the 
+reference count overflow for OperationRegion objects by preventing 
+fieldUnits from incrementing their parent OperationRegion's reference 
+count.
+
+Replaced one-element arrays with flexible-arrays, which were introduced 
+in C99.
+
+Restored the readme file containing the directions for generation of 
+ACPICA from source on MSVC 2017. Updated the file for MSVC 2017. File is 
+located at: generate/msvc2017/readme.txt
+
+2) iASL Compiler/Disassembler and ACPICA tools: 
+
+iASL: Fixed a regression found in version 20200214. Prevent iASL from 
+emitting an extra byte of garbage data when control methods declared a 
+single parameter type without using braces. This extra byte is known to 
+cause a blue screen on the Windows AML interpreter.
+
+iASL: Made a change to allow external declarations to specify the type of 
+a named object even when some name segments are not defined.
+This change allows the following ASL code to compile (When DEV0 is not 
+defined or not defined yet):
+
+    External (\_SB.DEV0.OBJ1, IntObj)
+    External (\_SB.DEV0, DeviceObj)
+
+iASL: Fixed a problem where method names in "Alias ()" statement could be 
+misinterpreted. They are now interpreted correctly as method invocations.
+
+iASL: capture a method parameter count (Within the Method info segment, 
+as well as the argument node) when using parameter type lists.
+
+----------------------------------------
+
+
 28 May 2020. Summary of changes for version 20200528: